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Type :
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starter
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Specification :
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1.2KW 12V
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Number of feet :
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11T
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Brand :
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nuojin
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Number :
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18219 129242-77010
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Quality :
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Remanufacture
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Delivery time :
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10 day
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Most Yanmar and Komatsu equipment (such as excavators) are construction machinery. The installation of their 1.2KW/12V starter motors must comply with general specifications for construction machinery starter motors while adapting to the engine compartment layout characteristics of both equipment types. During operation, key focus should be placed on mechanical fitment and electrical safety. The specific installation steps are as follows:
Wear safety goggles and non-slip gloves. Prepare tools including a socket wrench set, torque wrench, lithium-based grease, multimeter, and cleaning cloths.
First, park the equipment on a level surface, engage the handbrake to secure the wheels. Disconnect the negative battery cable to eliminate the risk of short-circuit sparking during installation. If the engine has just been shut down, wait for the components to cool to room temperature before proceeding.
Verify that the 1.2KW/12V starter motor model is compatible with the corresponding Yanmar or Komatsu equipment.
Inspect the starter motor housing for no cracks, terminal posts for no oxidation or corrosion, and ensure the solenoid switch and overrunning clutch gear extend and retract smoothly.
Wipe oil, dust, and debris from the starter motor mounting surface on the engine side using a cleaning cloth, and also clean the starter motor's contact surface to ensure tight fitment during installation. Additionally, apply lithium-based grease to the starter motor's O-ring, overrunning clutch spiral splines, and other relevant parts in advance to improve transmission smoothness.
Precisely align the starter motor with the mounting position between the engine and flywheel housing. Adjust the angle to achieve initial meshing between the starter drive gear and the flywheel ring gear, and align the bolt holes on the starter motor with those on the mounting bracket (starter motors for Yanmar/Komatsu construction machinery typically feature a 2-3 bolt mounting design).
First, hand-tighten the fixing bolts to position the starter motor and prevent displacement. Then use a torque wrench to tighten the bolts to the standard specified in the equipment manual. If no specific value is provided, use the general torque range of 49-63.7N·m. Avoid under-tightening (which may cause vibration during operation) or over-tightening (which may deform the starter motor housing). If the end-face gap between the drive gear and the flywheel ring gear is abnormal after installation, fine-tune it by adding or removing compatible gaskets.
First, connect the thick wire from the positive battery terminal to the starter motor's B-terminal (or Terminal 30), and tighten the fixing nut with a torque wrench to 9-10N·m.
Then insert the control wire connector corresponding to the solenoid switch into the matching S-terminal interface, ensure the buckle is securely locked, and mark the wiring position to avoid confusion. After connection, organize the wiring harness to prevent it from wrapping around the starter motor's moving components or high-temperature areas of the engine. Use wiring clips to secure the harness if necessary.
Reconnect the negative battery terminal. Use a multimeter to check that the input voltage of the starter motor is stably maintained at 12V.
Briefly activate the starter motor for a no-load test, observing for smooth operation with no abnormal noise or severe vibration. Simultaneously, check that the drive gear extends and retracts smoothly. If jamming occurs, promptly inspect the lubrication or gap conditions.
Start the engine and check:
Smooth meshing between the starter gear and the flywheel ring gear.
The starter motor can disengage promptly after the engine starts (no idling or abnormal noise).
If the starter motor lacks power, inspect for loose terminal connections. If there is meshing noise, fine-tune the gap by adjusting the gaskets again.
If components such as the engine cover or air pipes were removed during installation, reset them one by one and tighten the bolts.
Finally, conduct a comprehensive inspection to ensure all connection points are secure, the wiring harness is neatly arranged, and the starter motor shows no signs of abnormal heating. The installation is then complete.
(Focusing on the operating characteristics of construction machinery starter motors, combined with the engine compartment layout and operating environment requirements of Yanmar/Komatsu equipment, covering safety standards, assembly taboos, technical specifications, and fault prediction to ensure installation reliability and equipment operational stability)
Before installation/disassembly, two critical operations must be completed: ① Disconnect the negative battery cable (Removal sequence: Negative → Positive; Reinstallation sequence: Positive → Negative) and wrap the terminal with insulating tape to prevent accidental contact; ② Park the equipment on a level, hard surface, fully engage the handbrake, and chock the wheels. For excavators, retract the bucket and level the tracks to avoid safety accidents caused by unexpected equipment movement. Hot-plugging wires or touching terminal posts is strictly prohibited. For temporary testing, disconnect the starter motor's control wire separately.
Mandatorily wear full protective equipment: safety goggles (to prevent metal debris and oil splatter from entering the eyes), non-slip and cut-resistant gloves (to enhance tool grip and avoid scratches or electric shock), and safety shoes (impact and puncture resistant). The operating environment must be away from flammable and explosive materials (e.g., diesel, hydraulic oil, oil-soaked rags). Avoid outdoor operations in rainy or windy weather. In humid environments, dry hands before touching electrical circuits to prevent short-circuit sparking in the 12V system.
Use tools of matching specifications; do not replace torque wrenches with regular wrenches (severe vibration in construction machinery can lead to component failure if torque is inaccurate). High-voltage testing tools are strictly prohibited for 12V circuits to prevent damage to the solenoid switch or equipment ECU. Avoid colliding with precision components such as sensors and hydraulic pipeline joints in the engine compartment during operation to prevent hydraulic oil leakage or electronic component damage.
References：
The installation precautions for the 1.2KW/12V starter motors of Yanmar and Komatsu mentioned earlier are not derived from the official original maintenance manuals of Yanmar/Komatsu or any single authoritative document. Instead, they are compiled and summarized by integrating the characteristics of these two brands' construction equipment, general maintenance specifications for construction machinery starter motors, relevant industry standards, and practical operational experience in the automotive and construction machinery maintenance fields. The specific reference bases are as follows:
Parameters mentioned in the content, such as the starter motor's 2-3 bolt mounting design, the 49-63.7N·m tightening torque for fixing bolts, and the 9-10N·m tightening torque for the B-terminal post, are consistent with the general assembly rules of starter motors for construction machinery like Yanmar and Komatsu. Requirements stated on Changsha Shunqi Network, such as the need to ensure secure power connections and good sealing at the installation site for Yanmar starter motors, also align with the relevant specifications for electrical connections and sealing protection in the content. These form the core foundation for the content's adaptability to the two types of equipment.
Safety requirements, such as disconnecting the negative battery cable before installation, wearing protective equipment like safety goggles, and prohibiting violent impacts on components, are consistent with the general safety guidelines for starter motor disassembly and assembly published on platforms such as Autohome and Pacific Auto Q&A. Additionally, the processes of conducting no-load tests and load verification after installation, as well as details like the single start duration not exceeding 5 seconds and the requirement for intervals between consecutive starts during no-load tests, comply with the general technical logic for 12V starter motor installation. These are universal operational specifications for such electromechanical components in the maintenance field.
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